21031211101231 has 8 divisors (see below), whose sum is σ = 21284938629360. Its totient is φ = 20777491655232.

The previous prime is 21031211101181. The next prime is 21031211101253. The reversal of 21031211101231 is 13210111213012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21031211101231 - 2³³ = 21022621166639 is a prime.

It is a super-2 number, since 2×21031211101231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031211101199 and 21031211101208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031211101291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299211 + ... + 7276483.

It is an arithmetic number, because the mean of its divisors is an integer number (2660617328670).

Almost surely, 2^{21031211101231} is an apocalyptic number.

21031211101231 is a deficient number, since it is larger than the sum of its proper divisors (253727528129).

21031211101231 is an equidigital number, since it uses as much as digits as its factorization.

21031211101231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041065.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21031211101231 its reverse (13210111213012), we get a palindrome (34241322314243).

The spelling of 21031211101231 in words is "twenty-one trillion, thirty-one billion, two hundred eleven million, one hundred one thousand, two hundred thirty-one".